This adds the libweston capability bit for "color operations" which refers to a renderer's support for operations needed for color management. GL-renderer will grow the support while Pixman-renderer will not, which is why the cap is needed. To make an example use of the cap, this also adds new API: weston_output_set_renderer_shadow_buffer(). This is a temporary API to enable future experimental features. The first such feature will be the renderer internal shadow buffer, the boolean variable for it taken from Harish Krupo's "weston.ini: introduce use-shadow-fbo in output config". Obviously this patch does not implement the renderer shadow buffer. No renderer sets WESTON_CAP_COLOR_OPS yet so trying to enable it will fail. The documentation here is deliberately vague, because the bits needed for color management will come in trickling for a long time until we can call it color management in any sense. Until then, the temporary API shall remain, perhaps poorly named. Cc: Harish Krupo <harishkrupo@gmail.com> Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>dev
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